Dative Bond Arrow in Ammonium Ion

Steps:

• Recall NH4+ structure: nitrogen bonded to four hydrogens, one dative covalent bond from nitrogen's lone pair.
• Identify dative bond: lone pair from N shared with H+.
• Arrow convention: points from donor (N) to acceptor (H).
• Evaluate diagrams: correct one shows arrow from N to one H, others as regular bonds.

Why C is correct:

• Arrow points from N to H, matching dative bond definition where it indicates direction of lone pair donation.

Why the others are wrong:

• A: Arrow points from H to N, reversing donor-acceptor direction.
• B: No arrow shown, failing to distinguish dative from regular bonds.
• D: Arrow points to N from multiple H, misrepresenting single dative bond.

Final answer: C